This is the 4.15.12 stable release

* tag 'v4.15.12': (53 commits)
  Linux 4.15.12
  phy: phy-brcm-usb-init: Power down USB 3.0 PHY when XHCI disabled
  phy: phy-brcm-usb-init: DRD mode can cause crash on startup
  phy: phy-brcm-usb-init: Some Low Speed keyboards fail on 7271
  phy: phy-brcm-usb: Fix two DT properties to match bindings doc
  usb: gadget: udc: renesas_usb3: fix oops in renesas_usb3_remove()
  usb: dwc3: of-simple: fix oops by unbalanced clk disable call
  usb: dwc3: core: Power-off core/PHYs on system_suspend in host mode
  usb: dwc3: Fix GDBGFIFOSPACE_TYPE values
  USB: gadget: udc: Add missing platform_device_put() on error in bdc_pci_probe()
  dt-bindings: usb: fix the STM32F7 DWC2 OTG HS core binding
  usb: dwc2: fix STM32F7 USB OTG HS compatible
  scsi: qla2xxx: Fix crashes in qla2x00_probe_one on probe failure
  scsi: qla2xxx: Fix logo flag for qlt_free_session_done()
  scsi: qla2xxx: Fix NULL pointer access for fcport structure
  scsi: qla2xxx: Fix smatch warning in qla25xx_delete_{rsp|req}_que
  btrfs: Fix memory barriers usage with device stats counters
  btrfs: remove spurious WARN_ON(ref->count < 0) in find_parent_nodes
  btrfs: Fix use-after-free when cleaning up fs_devs with a single stale device
  btrfs: alloc_chunk: fix DUP stripe size handling
  ...